The correct answer is D. Together
Step-by-step explanation:
A prefix is a syllable or type of affix that is added before a word and adds meaning to it, prefixes are one of the main parts that compose words and because of this, each prefix usually has a defined meaning. In the case of the prefix "com-" this means "with" or "together", this can be seen in the words "combine" that means to link or join together two or more elements or in the word "compose" that means creating something by putting together parts. This means in the case of word "compact" that means joined or fastened together, the prefix "com-" also means "together" and the while "pact" means fasten.